I would argue that "chasing money and success" is a trademark characteristic of what young people AREN'T doing, yet this study states they are the Loneliness age group.
Seriously, though, your comment seems to assume South Korean suicide rate is motivated by loneliness. If that's the case, you might want to give the rest of us an argument to support that assumption.
"In 2014 alone, some 840,000 companies sprang up, in a country with a population of 50 million. This high number of enterprises relative to GDP suggests that opening a business is a poplar economic activity for many South Koreans."
https://thediplomat.com/2016/01/what-entrepreneurship-means-...
Did they used to have those suicide rates since forever? Because in the past they were even more conformist (or you think e.g. 50s or feudal Korea was more individualistic?).
And of course they chase after work and money like crazy there...